Combination-boiler for heating apparatus and hot-water supply.



H. B. & E. DONALD.

GOMBINATION BOILER FOR HEATING APPARATUS AND HOT WATER SUPPLY.

APPLICATION FILED JUNE 12,1911.

Patented June 4, 1912.

2 SHEETS-SHEET 1.

Ira/EDITORS H. B. 8: E. S. DONALD.

COMBINATION BOILER FOR HEATING APPARATUS AND HOT WATER SUPPLY.

' APPLICATION FILED JUNE 12, 1911.

1,028,555, Patented June 4, 1912.

2 SHEETS-SHEET 2.

'rflzssza A I rulers-roa UNITED STATES PATENT OFFICE.

HENRY BARBER DONALD AND EDWIN SPRAGG DONALD, OF LEEDS, ENGLAND.

COMBINATION-BOILER FOR HEATING APPARATUS AND HOT-WATER. SUPPLY.

Specification of Letters Patent. Application filed June 12, 1911. Serial No. 633,192..

' Patented June 4, 1912.

To all whom it may concern:

Be it known that we, HENRY BARBER DoN- ALD' and EDWIN SPRAGG DONALD, subjects of the King of Great Britain and-Ireland, re-

siding at Leeds, in the county of York, England, have invented a new and useful Improvement in Combination-Boilers for Heating Apparatus and Hot-Water Supply, of which the following is a specification.

This invention relates to improvements in water heaters or boilers of the double-shell type in which two distinct and separate supplies of hot water (for domestic or other purposes) are generated from a single furnace arranged within the inner shell. I

Figure 1 is a sectional side elevation of our improved combination boiler." Fig. 2 is a rear elevation of same, partly in section. According to our saidinvention the firebox A is fitted or formed concentrically within the lower part of'an outer or pmmary boiler'B, while an inner or secondary boiler C having a series of inclined transverse water tubes D is fitted concentrically ary boiler within the upper part of the said primary boiler. The outer or primary boiler B ob tains its heat from the fire in the internal fire-box A, and the water heated in the said primary boiler is used for heating buildings (by means of pipes, radiators, and the like) or for other urposes. The inner or secondis formed with an annular shoulder E and is preferably secured by flanges F and bolts G, and obtains its heat from the hot. water in the primary boiler B circulating around the secondary boiler C and through the tubes D which intersectit. The water from the secondary boiler C is intended for use mainly as a domestic hot water supply, or for other purposes where a supply of clean hot water is required and where the water from the primary boiler B would be objectionable on account of the rust and other impurities deposited therein. The outer or primary boiler Bis made of iron (wrought or cast), and the inner or secondary boiler. of copper or other rustless metal.

H is the fuel feed door, I the fire door, J the smoke outlet, K the grate bars, L the ash pipes, P P the mud doors, Q R the second- I ary flow and return pipes, and S an outer cover inclosing an air space or a non-conducting packing.

Our improved combination boiler has the advantages that, firstly, two distinct and separate supplies of hot water are generated by the one fire; secondly, wear of plant is reduced to a minimum as the life of the secondary boiler is considerably increased by reason of its not coming into contact with the fire; and thirdly, the cleaning and internal inspection of the boilers is greatly facilitated, as when the flange bolts G are re.- leased the secondary boiler C can at once he lifted out and is itself quite open for cleaning, the primary boiler B at the same time being qu1te open at the top for inspection or cleaning, which can be done by any practical plumber or mechanic.-

We claim:

1. A combination boiler for heating purposes and hot water supply comprislng an outer boiler, a heating supply apparatus in communication therewith, means for heatin the outer boiler, a cover for the outer boiler at the top thereof, an inner boiler ex tending downwardly from said cover and adapted to be heated by the water within the outer boiler, conducting pipes for hot water circulation extending into said irmer boiler-.-

2. A combination boilerfor heating appaby an outer or primary iron boiler for the heating apparatus circulation), a re boxfitted or formed concentrically within the lower part of said primary boller, an inner or secondary copper boiler (for the domestic ratus and hot-water supply, characterized" hot water supply) fitted 'concentricall' and detachably .within the upper part '0 said primary boiler by means of flanges, bolts,, and annular shoulder, and a serles of mclined transverse water tubes intersectlng said secondary boiler, the hot water said primary boiler circulating around sa1ds ec ondary boiler and throng said mtersectmg water tubes, substantially as herein set forth.

HENRY BARBER DONALD. EDWIN- SPRAGG DQNALD.

Witnesses:

ALLAN BENNETI, V GUY BARKER Moss. 

